Device for extinguishing the flame of blasting charges



Nov. 12, 1929. M. WITTE 1,735,099

DEVICE FOR EXTINGUISHING THE FLAME OF BLASTING CHARGES Filed Aug. 31,1921 [22 zrenioz':

Attorney- Patented Nov. 12, 1929 UNITED STATES MARTIN WITTE, or BRESLAU,GERMANY DEVICE FOR EXTINGUISHIIJG THE FLAME OF BLASTING CHARGESApplication filed August 31, 1927, Serial No. 216,700, and in. GermanyJune 13, 1925.

This invention relates to devices for extingulshing the flame ofblasting charges.

Devices of this kind are known in which the ignition of the blastingcharge is positively dependent upon the ejection of water from nozzlesinto the gallery or against the stope or the like which is being actedupon. The

nozzles are supplied from a spraying pipe The object of the presentinvention is to render the quantity of water which flows from thenozzles or pipes during the explosion entirely independent oi the smallcross section of the spraying pipe and to eject such considerablequantities of water in a unit of time that not only the flame from theexplosion will be extinguished, but the dust which is disturbed by theexplosion and the smoke oi the explosion gases are precipitated.

For this purpose there is interposed between the spraying pipe of narrowcross sec tion and the water outlet, which has a correspondingly largecross section, and an intermediate member in the form of an air chamberserving as a water storing device. The air chamber has the lower partthereof gradually filled with water from the spraying pipe, whilstcompressed air is contained in the upper portion thereof. When theexplosion takes place the air chamber is rapidly emptied through anoutflow pipe of large cross-section and leading from the bottom thereofby reason of the sudden relez so oi? a closure of the outflow pipe, andthe water is suddenly projected towards the mouth of the blast charge.By the release of the closure of the outflow pipe a contact is actuatedwhich closes an electric circuit in which is included the electricignition of the charge. In this manner the explosion and the dischargeof the mass of water into the gallery and against the mouth of the borehole are rendered simultaneously.

A piston or a cover may serve as the closure for the outflow pipe, thepiston or cover being held closed by a locking member which is forcedopen when a predetermined maximum pressure is reached in theair chamber.

A form oi constructionof the invention is illustrated in theaccompanying drawing, of which Fig. l is a diagrammatic sectional viewshowing the device in position, and Fig. 2 is a vertical cross-sectionthrough the air chamber on an enlarged scale.

The container [4 may be connected by a tubulure h and a hose 7' eitherwitha Water spraying supply .9 or a compressed air sup- Pyt.

To the closed container a is connected the outflow pipe .7). This isclosed by a piston a which is carried by a rod 6, c anchored at (l. Theweakest point of the rod is formed by an intermediate member f ofpredeterminedtensile strength and which is connected rigidly to the twoportions of the rod.

WVhen the device is in use theaxis of the outflow pipe 5 is directedtowards the mouth of the blast hole 9 and the lower portion of thecontainer a and the outflow pipe are filled with water, the air beingallowed to escape from the pipe through the valve g. Compressed air isnow passed into the container a through the pipe h. WVhen the compressedair above the water level has reached the required pressure theintermediate member f is fractured, the piston 0 is forced out and astream of water under pressure and of large cross section is directedagainst the mouth of the blast hole 9. When the piston 0 is ejected fromthe pipe the strap i is rocked on the pivot 70 and the lever Z rigidlyconnected to the strap 11 is pressed against the contact m. The contactthen closes a circuit through the wires 72, a connected to the electricignition for the charge in the bore hole g. In order to prevent thepiston c from being projected against the mouth of the blast hole g itis connected by means of the ring 0 and a rope or chain 19 to amine postor the like.

In view of the varied position of the blast holes the device may besecured with the outflowpipe at a suitable height and directed in asuitable direction on a stay beam. Then it is preferred to allow thestream of water to flow towards the mouth of the blast hole in adistributed manner instead of in a closed stream, such a distributioncan be obtained by the use of inclined guide blades which are mounted inthe outflow pipe 6.

1. In a device for extinguishing the flame of blast charges and forprecipitating the disturbed dust and the smoke of the explosion gaseswherein the ignition is efiected when a water discharging device isbrought into operation, an air chamber situated in "front of the blastcharge, means for alternately connecting the said air chamber with awater spraying supply and an air compressor, a tubulure of relativelylarge cross-section extending from the bottom of the air chamber andbeing directed towards the mouth of the blast charge, :an applianceclosing the said tubulure, means for suddenly opening the closure :andthereby emptying the said chamber and ejecting the water onto the blastcharge, and :means tor simultaneously igniting the blast charge.

2. In a device for extinguishing the flame of blast charges and forprecipitating the disturbed dust and the smoke of the explosion gaseswherein the ignition is efiected when a water discharging device isbroughtinto operation, an ai-r-chambersituated in front of :the blastcharge, means for alternately connect-ingithesaid airchamber with .awater spraying supply and an air compressor, a tubulure of-relativelylarge cross-section extending from the bottom of'the air chamber andbeing directed towards the mouth of the blast charge, 79.11 applianceclosing the said :tubulu-re, Ea frangible .member holding the -.closureand adapted to be tracturedwhen a predetermined pressure-is reached inthe air chamber, :and means for simultaneously igniting the blastcharge.

3. .111 a device torextinguishing the name of blast charges and forprecipitating the disturbeddustand thezsrnoke of the explosion gaseswherein 'theignition is eiiected when a water discharging device isbrought into operation, :an air chamber situated in front of the blastcharge, means ior alternatey connectingthe said-air chamber with a waterspraying supply and an air compressor, a tubulure of relatively largecross-section extending from the bottom of the air chamber andbeingdirected towards the mouth-of the blast eharge,acoverclosingthesaid tubulure, means for suddenly releasing. the said coverand thereby -.e1npty-ing the said chamber and ejecting the water ontothe blast charge, and means forsimu'ltaneously igniting the-blastcharge. 1

A. In a device forextinguishing the flame of blast charges and forprecipitating the disturbed ClLlStsZtllEl-thSIDOkS'OfthQ explosion gaseswherein-the ignition is effected when a water discharging device isbrought into operation, an air chamber situated in front MARTIN WITTE.

